I have a TiVo Premiere XL (Series 4) with a Multi-Stream CableCARD from Charter Communications (my cable provider). Several months ago, Charter Communications began to use Switched Digital Video (SDV), so I was provided with an SDV tuning adapter. For over a month now my cable service has been hit-or-miss on my TiVo-equipped TV. Other Charter Communications services/devices are unaffected: two other TVs with generic DVR boxes (which don't use a CableCARD because they are from Charter Communications), a TV with cable but not cable box, high-speed cable internet, and VOIP phone service. Therefore, the issue must lie either with the CableCARD or the TiVo. Symptoms: channels completely missing, other channels with significant digital distortion. Attempted solutions so far: replaced CableCARD twice, replaced SDV tuning adapter, and requested dozens of "CableCARD pairing hits" from Charter Communications. The CableCARD pairing hits (which I hear are stronger than a pairing hit for a generic DVR box) seem to help somewhat, but the problem either comes back within a week or never fully fixes in the first place. I'm desperate for a solution. Charter Communications technicians (either tech support over the phone, or those in person during a service visit) are clueless and incompetent - partly due to their lack of familiarity with CableCARDs. Please offer any help you can, because I'm going crazy! Two questions: - How do I fix this problem? - Is it true that multiple, repeated CableCARD pairing hits sent by Charter Communications can damage the CableCARD or TiVo devices?